Question

A railroad train is traveling at 32 m/s in still air. The frequency of the train whistle is 350 Hz. What is the wavelength of the sound and the frequency of the sound heard by the listener in front of the locomotive? (1 point)

Answer 1

Answer:

0.9 m,386.36 Hz

Explanation:

We are given that

Speed of train,vs=32 m/s

Frequency of whistle,f0=350 Hz

We have to find the wavelength of sound and the frequency of heard by the listener in front of the locomotive.

Speed of sound=$v=340 m/s$

We know that the frequency of listener

$f=f_0(\frac{v}{v-v_s})$

Using the formula

$f=350\times(\frac{340}{340-32})$

$f=386.36 Hz$

Wavelength,$\lambda=\frac{v}{f}$

Using the formula

$\lambda=\frac{340}{386.36}=0.9 m$